Credits:
Model Created by 22ndTG
converted for GTA IV and EFLC by CORE.MAX2010
Special thanks and credit to ColtMaster1911, who shared his skill
Thanks very much and credit to KillerFist666 who give tecnical support to convert FPS Banana weapons models
Player Model By ac.amir http://gtaiv-skins.blogspot.com/ and http://www.gta4-mods.com/search/ac.amir
Soap Head (from Ac.Amir) WITHOUT Mohawk and more Emotions by The PiovaN
http://www.gta4-mods.com/search/The%20PiovaN
Player clothes by Wapeddell

Note:
1.- You must use Open IV Tool, Download from
http://openiv.com/WebIV/guest.php?get=0
2.- Install it

Install the weapon:
1.- Backup originals files
Can replace the pumpshot in GTA IV and the AA-12 in EFLC
2.- Open OpenIV and replace w_pumpshot.wdr and w_pumpshot.wtd to C: ... Grand Theft Auto IV/pc/models/cdimages/weapons.img
If you have EFLC just replace the aa-12. You do not need to replace the lines in the weaponinfo file.
3.- Save and rebuild

Install the WeaponInfo.xml Lines
(To change round capacity to 30, rate of fire and others adjustments)
Backup original file before...
1.- Go to C: ... Grand Theft Auto IV/common/data/WeaponInfo.xml
2.- Open the WeaponInfo.xml file with wordpad or other tool
3.- To replace the pumpshot: Find the "pumpshot" string and replace the provided lines
(If you have EFLC You do not need to replace the lines in the weaponinfo file and animgrp.dat
4.- Go to C: ... Grand Theft Auto IV/common/data/animgrp.dat, find this string "gun@uzi"
5.-Then copy the follow lines under the line that have "gun@uzi" string

To add the gun@aa12.wad file in anim.img file:
If you have EFLC You do not need to add gun@aa12.wad in the anim.img file
1.- Go to C: ... Grand Theft Auto IV /pc / anim / anim.img file
2.- Add the provided gun@aa12.wad in the anim.img file
3.- Save rebuild and exit

CORE.MAX2010, buddy, I prefer the HQ one like you did to the previous. Oh, for some reasons, people wants the original ones if they have IV not EFLC. I would like to keep the original, but add the files into the archive (like presenting different WTD files or PNG-formatted pictures like cjisntgay do, you can check his mod if you like).

Oh, the thing is, I don't know where the slugs come out (the only thing to notice is when firing to see the slug color), so that is up to your decision on how do you want for this great mod.

I hope that you can do it. I can only tweak weapon lines and exactly good on picture-editing. Anyway, naming the icon with saying "Buckshot" or "Explosive" under the weapon picture is waaaaay too easy, and everyone can do it with Photoscape.

@AzureCrow: Hey man: I did delete the big mag and added short mag but: When I did convert the model from 3DS-Max 2012 to GTA IV it get several errors. So I did convert the model to obj and 3DS formats to edit with Zmodeler and convert it to GTA IV then the model get more errors. I will try to fix it one more time tonight and tomorrow. Please wait, because this errors are unusual

CORE.MAX2010, buddy, have you done with the new weapon icon for TBoGT like KanePurcell do? Updates are done, just, waiting for the icon. Explosives and Buckshot icon. Just that, and please keep the original icon for those who don't want those or only have IV installed.